If you see the following error message when executing ‘zpool status’ after “upgrading” Proxmox to the (currently) latest version with ZoL 0.6.4 instead of 0.6.3:
zpool: Symbol `spa_feature_table' has different size in shared object, consider re-linking
“Re-linking” doesn’t have a special meaning in ZFS/ZoL terminology, it rather just describes the usual linking step after compiling some source code.
The most likely cause is that some new, updated and required packages have not been installed (e.g. with ‘uname -a’, you’ll see that the old kernel is still running, even after rebooting). Usually, this happens if one executes “apt-get update && apt-get upgrade” (as usual) rather than “apt-get update && apt-get dist-upgrade“. So, in order to solve this problem, do:
# apt-get update && apt-get dist-upgrade # reboot
In this case, ZoL 0.6.4 also includes a couple of new features which can be enabled for all local ZFS pools by executing:
# zpool upgrade -a This system supports ZFS pool feature flags. Enabled the following features on 'rpool': spacemap_histogram enabled_txg hole_birth extensible_dataset embedded_data bookmarks